MGM
230/400V 50Hz (277/480V 60Hz) rated voltage
motor running on 220/380V 60Hz power system.
Motor Voltage and Frequency Supply
14
MGM motors are provided with a standard voltage rating of 230/400V
±
10% 50 Hz (IEC 38, CENELEC HD 472, CEI 8-6)
“European voltage”. On request they can be provided with different operating voltages.
The operating voltages at 50Hz and 60Hz are clearly indicated on the motor nameplate (see motor nameplate section). MGM
motors are suitable to work within a voltage variation of 10% on the nameplate voltage. The available rated voltages are shown
in the table below under “Nameplate voltage” at 50 Hz and 60 Hz, while the corresponding voltages on which the motor is
able to run are shown under “Usable voltage”.
GENERAL CHARACTERISTICS
Nameplate voltage
Usable voltage
It’s important to understand the torque vs. RPM curves
for different voltages supplied to the motor (on the side)
particularly for those motors running under heavy duty. If
you are supplying the brake with a lower voltage than the
nominal one, the air gap has to be adjusted more frequently
than in the case of nominal voltage supply in order to
guarantee a constant high brake performance.
MGM motors with rated voltage of 230/400V 50Hz maintain the same rated and starting torque if operating at 277/480V 60 Hz while the
RPM increase by about 20% (see torque vs. RPM comparing curves 1 and 2 here below).
The AC brake coil on BA series works equally well if operating either at 230/400V 50Hz or at 277/480V 60Hz. The DC brake coil with
nameplate voltage of 110V, 230V or 400V on BM and BA series has to be supplied at 110V, 230V or 400V single phase respectively both
at 50 Hz or 60 Hz (i.e. a 230V brake can be supplied single-phase at 230V 50Hz or at 230V 60 Hz).
MGM is able to provide motors and brake coil suitable for operating on 220/380V 60Hz power supply. It is not advisable to run motors
designed for 230/400V 50Hz and 277/480V 60Hz on 220/380V 60Hz voltage supply as the power remains the same, but the starting
torque is reduced by 35% (see curves 1 and 3 here below).
MGM strongly recommends not to use a 277/480V 60Hz (230/400V 50Hz) AC brake coil on 220/380V 60Hz power system as it results
in a significant loss of performance.
DC brakes with a rated voltage of 230V 50Hz can be used on 220V 60Hz and those with a rated voltage of 400V 50Hz on 380V 60Hz
power system.
The diagram below shows different curves (torque vs. RPM) for a 230/400V 50Hz (277/480 60Hz) rated voltage motor running on different
power systems.
230/400V 50Hz (277/480V 60Hz) rated voltage
motor running on 230/400V 50 Hz power system.
230/400V 50Hz (277/480V 60Hz) rated voltage
motor running on 277/480V 60 Hz power system.
It’s important to point out that, if running the motor at 60Hz instead of 50 Hz, the maximum number of starts reduces by about 15-20%, and
the noise level increases by about 3dB due to the increased speed of the cooling fan.
3
Operating at 60Hz
2
1
100%
65%
100%
120%
RPM %
Torque %
1
2
3
0
10
20
30
40
50
60
70
80
90
100
110
120
0
10
20
30
40
50
60
70
80
90
Torque %
440 V
400 V
360 V
RPM %
100
230 / 400
50
190 / 330
50
208 / 360
50
400 / 690
50
277 / 480
60
220 / 380
60
254 / 440
60
480 / 830
60
240 / 415
50
220 / 380
50
265 / 460
60
208 / 360
60
230 / 400
60
200 / 346
50
240 / 415
60
380 / 660
50
415 / 717
50